How to Calculate and Solve for Drag Force | Transport Phenomena

Last Updated on October 2, 2021

The image above represents drag force.

To compute for drag force, five essential parameters are needed and these parameters are Density (ρ), Viscosity (η), Length of Tube (L), Width of Tube (W) and Velocity at Infinite Flow (v).

The formula for calculating drag force:

Fk = 0.664√(ρηLW²v³)


Fk = Drag Force
ρ = Density
η = Viscosity
L = Length of Tube
W = Width of Tube
v = Velocity at Infinite Flow

Let’s solve an example;
If density is 10, the viscosity is 12, the length of tube is 16, the width of tube is 14 and the velocity at infinite flow is 11. Find the drag force?

This implies that;

ρ = Density = 10
η = Viscosity = 12
L = Length of Tube = 16
W = Width of Tube = 14
v = Velocity at Infinite Flow = 11

Fk = 0.664√(ρηLW²v³)
Fk = 0.664√((10)(12)(16)(14)²(11)³)
Fk = 0.664√((10)(12)(16)(196)(1331))
Fk = 0.664√(500881920)
Fk = 0.664 (22380.39)
Fk = 14860.57

Therefore, the drag force is 14860.57 N.

Nickzom Calculator – The Calculator Encyclopedia is capable of calculating the drag force.

To get the answer and workings of the drag force using the Nickzom Calculator – The Calculator Encyclopedia. First, you need to obtain the app.

You can get this app via any of these means:

Web –

To get access to the professional version via web, you need to register and subscribe to have utter access to all functionalities.
You can also try the demo version via

Android (Paid) –
Android (Free) –

Apple (Paid) –
Once, you have obtained the calculator encyclopedia app, proceed to the Calculator Map, then click on Materials and Metallurgical under Engineering.

Now, Click on Transport Phenomena under Materials and Metallurgical

Now, Click on Drag Force under Transport Phenomena

The screenshot below displays the page or activity to enter your values, to get the answer for the drag force according to the respective parameter which is the Density (ρ), Viscosity (η), Length of Tube (L), Width of Tube (W) and Velocity at Infinite Flow (v).

Now, enter the values appropriately and accordingly for the parameters as required by the Density (ρ) is 10, Viscosity (η) is 12, Length of Tube (L) is 16, Width of Tube (W) is 14 and Velocity at Infinite Flow (v) is 11.

Finally, Click on Calculate

As you can see from the screenshot above, Nickzom Calculator– The Calculator Encyclopedia solves for the drag force and presents the formula, workings and steps too.

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